2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
58 /* ====================================================================
59 * Copyright (c) 1998-1999 The OpenSSL Project. All rights reserved.
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
87 * 6. Redistributions of any form whatsoever must retain the following
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
115 #include <openssl/evp.h>
116 #include <openssl/buffer.h>
117 #include "ssl_locl.h"
119 static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
121 static int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
123 static int ssl3_get_record(SSL *s);
124 static int do_compress(SSL *ssl);
125 static int do_uncompress(SSL *ssl);
126 static int do_change_cipher_spec(SSL *ssl);
128 static int ssl3_read_n(SSL *s, int n, int max, int extend)
130 /* If extend == 0, obtain new n-byte packet; if extend == 1, increase
131 * packet by another n bytes.
132 * The packet will be in the sub-array of s->s3->rbuf.buf specified
133 * by s->packet and s->packet_length.
134 * (If s->read_ahead is set, 'max' bytes may be stored in rbuf
135 * [plus s->packet_length bytes if extend == 1].)
141 /* start with empty packet ... */
142 if (s->s3->rbuf.left == 0)
143 s->s3->rbuf.offset = 0;
144 s->packet = s->s3->rbuf.buf + s->s3->rbuf.offset;
145 s->packet_length = 0;
146 /* ... now we can act as if 'extend' was set */
149 /* if there is enough in the buffer from a previous read, take some */
150 if (s->s3->rbuf.left >= (int)n)
154 s->s3->rbuf.offset+=n;
158 /* else we need to read more data */
163 /* avoid buffer overflow */
164 int max_max = SSL3_RT_MAX_PACKET_SIZE - s->packet_length;
165 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
166 max_max += SSL3_RT_MAX_EXTRA;
171 off = s->packet_length;
172 newb = s->s3->rbuf.left;
173 /* Move any available bytes to front of buffer:
174 * 'off' bytes already pointed to by 'packet',
175 * 'newb' extra ones at the end */
176 if (s->packet != s->s3->rbuf.buf)
179 memmove(s->s3->rbuf.buf, s->packet, off+newb);
180 s->packet = s->s3->rbuf.buf;
185 /* Now we have off+newb bytes at the front of s->s3->rbuf.buf and need
186 * to read in more until we have off+n (up to off+max if possible) */
191 s->rwstate=SSL_READING;
192 i=BIO_read(s->rbio, &(s->s3->rbuf.buf[off+newb]), max-newb);
196 SSLerr(SSL_F_SSL3_READ_N,SSL_R_READ_BIO_NOT_SET);
202 s->s3->rbuf.left = newb;
208 /* done reading, now the book-keeping */
209 s->s3->rbuf.offset = off + n;
210 s->s3->rbuf.left = newb - n;
211 s->packet_length += n;
215 /* Call this to get a new input record.
216 * It will return <= 0 if more data is needed, normally due to an error
217 * or non-blocking IO.
218 * When it finishes, one packet has been decoded and can be found in
219 * ssl->s3->rrec.type - is the type of record
220 * ssl->s3->rrec.data, - data
221 * ssl->s3->rrec.length, - number of bytes
223 static int ssl3_get_record(SSL *s)
225 int ssl_major,ssl_minor,al;
231 unsigned char md[EVP_MAX_MD_SIZE];
233 unsigned int mac_size;
240 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
241 extra=SSL3_RT_MAX_EXTRA;
246 /* check if we have the header */
247 if ( (s->rstate != SSL_ST_READ_BODY) ||
248 (s->packet_length < SSL3_RT_HEADER_LENGTH))
250 n=ssl3_read_n(s,SSL3_RT_HEADER_LENGTH,
251 SSL3_RT_MAX_PACKET_SIZE,0);
252 if (n <= 0) return(n); /* error or non-blocking */
253 s->rstate=SSL_ST_READ_BODY;
257 /* Pull apart the header into the SSL3_RECORD */
261 version=(ssl_major<<8)|ssl_minor;
264 /* Lets check version */
271 if (version != s->version)
273 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
274 /* Send back error using their
275 * version number :-) */
277 al=SSL_AD_PROTOCOL_VERSION;
282 if ((version>>8) != SSL3_VERSION_MAJOR)
284 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
289 (unsigned int)SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
291 al=SSL_AD_RECORD_OVERFLOW;
292 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG);
296 s->rstate=SSL_ST_READ_BODY;
299 /* get and decode the data */
300 if (s->rstate == SSL_ST_READ_BODY)
302 if (rr->length > (s->packet_length-SSL3_RT_HEADER_LENGTH))
305 n=ssl3_read_n(s,i,i,1);
306 if (n <= 0) return(n); /* error or non-blocking io */
308 s->rstate=SSL_ST_READ_HEADER;
311 /* At this point, we have the data in s->packet and there should be
312 * s->packet_length bytes, we must not 'overrun' this buffer :-)
313 * One of the following functions will copy the data from the
314 * s->packet buffer */
316 rr->input= &(s->packet[SSL3_RT_HEADER_LENGTH]);
318 /* ok, we can now read from 's->packet' data into 'rr'
319 * rr->input points at rr->length bytes, which
320 * need to be copied into rr->data by either
321 * the decryption or by the decompression
322 * When the data is 'copied' into the rr->data buffer,
323 * rr->input will be pointed at the new buffer */
325 /* Set the state for the following operations */
326 s->rstate=SSL_ST_READ_HEADER;
328 /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
329 * rr->length bytes of encrypted compressed stuff. */
331 /* check is not needed I belive */
332 if (rr->length > (unsigned int)SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
334 al=SSL_AD_RECORD_OVERFLOW;
335 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
339 /* decrypt in place in 'rr->input' */
342 if (!s->method->ssl3_enc->enc(s,0))
344 al=SSL_AD_DECRYPT_ERROR;
348 printf("dec %d\n",rr->length);
349 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
352 /* r->length is now the compressed data plus mac */
353 if ( (sess == NULL) ||
354 (s->enc_read_ctx == NULL) ||
355 (s->read_hash == NULL))
360 mac_size=EVP_MD_size(s->read_hash);
362 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size)
364 al=SSL_AD_RECORD_OVERFLOW;
365 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
368 /* check MAC for rr->input' */
369 if (rr->length < mac_size)
371 al=SSL_AD_DECODE_ERROR;
372 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT);
375 rr->length-=mac_size;
376 i=s->method->ssl3_enc->mac(s,md,0);
377 if (memcmp(md,&(rr->data[rr->length]),mac_size) != 0)
379 al=SSL_AD_BAD_RECORD_MAC;
380 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_MAC_DECODE);
386 /* r->length is now just compressed */
387 if (s->expand != NULL)
390 (unsigned int)SSL3_RT_MAX_COMPRESSED_LENGTH+extra)
392 al=SSL_AD_RECORD_OVERFLOW;
393 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
396 if (!do_uncompress(s))
398 al=SSL_AD_DECOMPRESSION_FAILURE;
399 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_DECOMPRESSION);
404 if (rr->length > (unsigned int)SSL3_RT_MAX_PLAIN_LENGTH+extra)
406 al=SSL_AD_RECORD_OVERFLOW;
407 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
412 /* So at this point the following is true
413 * ssl->s3->rrec.type is the type of record
414 * ssl->s3->rrec.length == number of bytes in record
415 * ssl->s3->rrec.off == offset to first valid byte
416 * ssl->s3->rrec.data == where to take bytes from, increment
420 /* we have pulled in a full packet so zero things */
423 /* just read a 0 length packet */
424 if (rr->length == 0) goto again;
428 ssl3_send_alert(s,SSL3_AL_FATAL,al);
433 static int do_uncompress(SSL *ssl)
438 rr= &(ssl->s3->rrec);
439 i=COMP_expand_block(ssl->expand,rr->comp,
440 SSL3_RT_MAX_PLAIN_LENGTH,rr->data,(int)rr->length);
450 static int do_compress(SSL *ssl)
455 wr= &(ssl->s3->wrec);
456 i=COMP_compress_block(ssl->compress,wr->data,
457 SSL3_RT_MAX_COMPRESSED_LENGTH,
458 wr->input,(int)wr->length);
468 /* Call this to write data
469 * It will return <= 0 if not all data has been sent or non-blocking IO.
471 int ssl3_write_bytes(SSL *s, int type, const void *_buf, int len)
473 const unsigned char *buf=_buf;
474 unsigned int tot,n,nw;
477 s->rwstate=SSL_NOTHING;
481 if (SSL_in_init(s) && !s->in_handshake)
483 i=s->handshake_func(s);
484 if (i < 0) return(i);
487 SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
495 if (n > SSL3_RT_MAX_PLAIN_LENGTH)
496 nw=SSL3_RT_MAX_PLAIN_LENGTH;
500 i=do_ssl3_write(s,type,&(buf[tot]),nw);
507 if (type == SSL3_RT_HANDSHAKE)
508 ssl3_finish_mac(s,&(buf[tot]),i);
511 (type == SSL3_RT_APPLICATION_DATA &&
512 (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)))
522 static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
525 unsigned char *p,*plen;
526 int i,mac_size,clear=0;
531 /* first check is there is a SSL3_RECORD still being written
532 * out. This will happen with non blocking IO */
533 if (s->s3->wbuf.left != 0)
534 return(ssl3_write_pending(s,type,buf,len));
536 /* If we have an alert to send, lets send it */
537 if (s->s3->alert_dispatch)
539 i=ssl3_dispatch_alert(s);
542 /* if it went, fall through and send more stuff */
545 if (len <= 0) return(len);
551 if ( (sess == NULL) ||
552 (s->enc_write_ctx == NULL) ||
553 (s->write_hash == NULL))
559 mac_size=EVP_MD_size(s->write_hash);
563 /* write the header */
567 *(p++)=(s->version>>8);
568 *(p++)=s->version&0xff;
570 /* record where we are to write out packet length */
574 /* lets setup the record stuff. */
577 wr->input=(unsigned char *)buf;
579 /* we now 'read' from wr->input, wr->length bytes into
582 /* first we compress */
583 if (s->compress != NULL)
587 SSLerr(SSL_F_DO_SSL3_WRITE,SSL_R_COMPRESSION_FAILURE);
593 memcpy(wr->data,wr->input,wr->length);
597 /* we should still have the output to wr->data and the input
598 * from wr->input. Length should be wr->length.
599 * wr->data still points in the wb->buf */
603 s->method->ssl3_enc->mac(s,&(p[wr->length]),1);
604 wr->length+=mac_size;
609 /* ssl3_enc can only have an error on read */
610 s->method->ssl3_enc->enc(s,1);
612 /* record length after mac and block padding */
613 s2n(wr->length,plen);
615 /* we should now have
616 * wr->data pointing to the encrypted data, which is
618 wr->type=type; /* not needed but helps for debugging */
619 wr->length+=SSL3_RT_HEADER_LENGTH;
621 /* Now lets setup wb */
625 s->s3->wpend_tot=len;
626 s->s3->wpend_buf=buf;
627 s->s3->wpend_type=type;
628 s->s3->wpend_ret=len;
630 /* we now just need to write the buffer */
631 return(ssl3_write_pending(s,type,buf,len));
636 /* if s->s3->wbuf.left != 0, we need to call this */
637 static int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
643 if ((s->s3->wpend_tot > (int)len)
644 || ((s->s3->wpend_buf != buf) &&
645 !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))
646 || (s->s3->wpend_type != type))
648 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
657 s->rwstate=SSL_WRITING;
659 (char *)&(s->s3->wbuf.buf[s->s3->wbuf.offset]),
660 (unsigned int)s->s3->wbuf.left);
664 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BIO_NOT_SET);
667 if (i == s->s3->wbuf.left)
670 s->rwstate=SSL_NOTHING;
671 return(s->s3->wpend_ret);
675 s->s3->wbuf.offset+=i;
680 int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len)
687 if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
688 if (!ssl3_setup_buffers(s))
691 if (!s->in_handshake && SSL_in_init(s))
693 i=s->handshake_func(s);
694 if (i < 0) return(i);
697 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
702 s->rwstate=SSL_NOTHING;
704 /* s->s3->rrec.type - is the type of record
705 * s->s3->rrec.data, - data
706 * s->s3->rrec.off, - offset into 'data' for next read
707 * s->s3->rrec.length, - number of bytes. */
711 if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
713 ret=ssl3_get_record(s);
714 if (ret <= 0) return(ret);
717 /* we now have a packet which can be read and processed */
719 if (s->s3->change_cipher_spec && (rr->type != SSL3_RT_HANDSHAKE))
721 al=SSL_AD_UNEXPECTED_MESSAGE;
722 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
726 /* If the other end has shutdown, throw anything we read away */
727 if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
730 s->rwstate=SSL_NOTHING;
734 /* Check for an incoming 'Hello Request' message from client */
735 if ((rr->type == SSL3_RT_HANDSHAKE) && (rr->length == 4) &&
736 (rr->data[0] == SSL3_MT_HELLO_REQUEST) &&
737 (s->session != NULL) && (s->session->cipher != NULL))
739 if ((rr->data[1] != 0) || (rr->data[2] != 0) ||
742 al=SSL_AD_DECODE_ERROR;
743 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
747 if (SSL_is_init_finished(s) &&
748 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
752 if (ssl3_renegotiate_check(s))
754 n=s->handshake_func(s);
755 if (n < 0) return(n);
758 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
764 /* ZZZ */ goto start;
767 /* if it is not the type we want, or we have shutdown and want
768 * the peer shutdown */
769 if ((rr->type != type) || (s->shutdown & SSL_SENT_SHUTDOWN))
771 if (rr->type == SSL3_RT_ALERT)
773 if ((rr->length != 2) || (rr->off != 0))
775 al=SSL_AD_DECODE_ERROR;
776 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_ALERT_RECORD);
783 /* clear from buffer */
786 if (s->info_callback != NULL)
788 else if (s->ctx->info_callback != NULL)
789 cb=s->ctx->info_callback;
794 cb(s,SSL_CB_READ_ALERT,j);
800 if (n == SSL_AD_CLOSE_NOTIFY)
802 s->shutdown|=SSL_RECEIVED_SHUTDOWN;
810 s->rwstate=SSL_NOTHING;
811 s->s3->fatal_alert=n;
812 SSLerr(SSL_F_SSL3_READ_BYTES,
813 SSL_AD_REASON_OFFSET+n);
815 ERR_add_error_data(2,"SSL alert number ",tmp);
816 s->shutdown|=SSL_RECEIVED_SHUTDOWN;
817 SSL_CTX_remove_session(s->ctx,s->session);
822 al=SSL_AD_ILLEGAL_PARAMETER;
823 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
831 if (s->shutdown & SSL_SENT_SHUTDOWN)
833 s->rwstate=SSL_NOTHING;
838 if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
840 if ( (rr->length != 1) || (rr->off != 0) ||
841 (rr->data[0] != SSL3_MT_CCS))
843 i=SSL_AD_ILLEGAL_PARAMETER;
844 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
849 s->s3->change_cipher_spec=1;
850 if (!do_change_cipher_spec(s))
856 /* else we have a handshake */
857 if ((rr->type == SSL3_RT_HANDSHAKE) &&
860 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
861 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
863 s->state=SSL_ST_BEFORE|(s->server)
868 n=s->handshake_func(s);
869 if (n < 0) return(n);
872 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
876 /* In the case where we try to read application data
877 * the first time, but we trigger an SSL handshake, we
878 * return -1 with the retry option set. I do this
879 * otherwise renegotiation can cause nasty problems
880 * in the non-blocking world */
882 s->rwstate=SSL_READING;
884 BIO_clear_retry_flags(bio);
885 BIO_set_retry_read(bio);
893 /* TLS just ignores unknown message types */
894 if (s->version == TLS1_VERSION)
899 case SSL3_RT_CHANGE_CIPHER_SPEC:
901 case SSL3_RT_HANDSHAKE:
902 al=SSL_AD_UNEXPECTED_MESSAGE;
903 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
905 case SSL3_RT_APPLICATION_DATA:
906 /* At this point, we were expecting something else,
907 * but have application data. What we do is set the
908 * error, and return -1. On the way out, if the
909 * library was running inside ssl3_read() and it makes
910 * sense to read application data at this point, we
911 * will indulge it. This will mostly happen during
912 * session renegotiation.
914 if (s->s3->in_read_app_data &&
915 (s->s3->total_renegotiations != 0) &&
917 (s->state & SSL_ST_CONNECT) &&
918 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
919 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
921 (s->state & SSL_ST_ACCEPT) &&
922 (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
923 (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
927 s->s3->in_read_app_data=0;
932 al=SSL_AD_UNEXPECTED_MESSAGE;
933 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
939 /* make sure that we are not getting application data when we
940 * are doing a handshake for the first time */
941 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
942 (s->enc_read_ctx == NULL))
944 al=SSL_AD_UNEXPECTED_MESSAGE;
945 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
949 if (len <= 0) return(len);
951 if ((unsigned int)len > rr->length)
956 memcpy(buf,&(rr->data[rr->off]),(unsigned int)n);
961 s->rstate=SSL_ST_READ_HEADER;
965 if (type == SSL3_RT_HANDSHAKE)
966 ssl3_finish_mac(s,buf,n);
969 ssl3_send_alert(s,SSL3_AL_FATAL,al);
974 static int do_change_cipher_spec(SSL *s)
980 if (s->state & SSL_ST_ACCEPT)
981 i=SSL3_CHANGE_CIPHER_SERVER_READ;
983 i=SSL3_CHANGE_CIPHER_CLIENT_READ;
985 if (s->s3->tmp.key_block == NULL)
987 s->session->cipher=s->s3->tmp.new_cipher;
988 if (!s->method->ssl3_enc->setup_key_block(s)) return(0);
991 if (!s->method->ssl3_enc->change_cipher_state(s,i))
994 /* we have to record the message digest at
995 * this point so we can get it before we read
996 * the finished message */
997 if (s->state & SSL_ST_CONNECT)
999 sender=s->method->ssl3_enc->server_finished_label;
1000 slen=s->method->ssl3_enc->server_finished_label_len;
1004 sender=s->method->ssl3_enc->client_finished_label;
1005 slen=s->method->ssl3_enc->client_finished_label_len;
1008 s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s,
1009 &(s->s3->finish_dgst1),
1010 &(s->s3->finish_dgst2),
1011 sender,slen,s->s3->tmp.peer_finish_md);
1016 int ssl3_do_write(SSL *s, int type)
1020 ret=ssl3_write_bytes(s,type,&s->init_buf->data[s->init_off],
1022 if (ret == s->init_num)
1024 if (ret < 0) return(-1);
1030 void ssl3_send_alert(SSL *s, int level, int desc)
1032 /* Map tls/ssl alert value to correct one */
1033 desc=s->method->ssl3_enc->alert_value(desc);
1034 if (desc < 0) return;
1035 /* If a fatal one, remove from cache */
1036 if ((level == 2) && (s->session != NULL))
1037 SSL_CTX_remove_session(s->ctx,s->session);
1039 s->s3->alert_dispatch=1;
1040 s->s3->send_alert[0]=level;
1041 s->s3->send_alert[1]=desc;
1042 if (s->s3->wbuf.left == 0) /* data still being written out */
1043 ssl3_dispatch_alert(s);
1044 /* else data is still being written out, we will get written
1045 * some time in the future */
1048 int ssl3_dispatch_alert(SSL *s)
1053 s->s3->alert_dispatch=0;
1054 i=do_ssl3_write(s,SSL3_RT_ALERT,&s->s3->send_alert[0],2);
1057 s->s3->alert_dispatch=1;
1061 /* If it is important, send it now. If the message
1062 * does not get sent due to non-blocking IO, we will
1063 * not worry too much. */
1064 if (s->s3->send_alert[0] == SSL3_AL_FATAL)
1065 (void)BIO_flush(s->wbio);
1067 if (s->info_callback != NULL)
1068 cb=s->info_callback;
1069 else if (s->ctx->info_callback != NULL)
1070 cb=s->ctx->info_callback;
1074 j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1075 cb(s,SSL_CB_WRITE_ALERT,j);